For piston and piston rod operating temperature are different, they should be selected. There is also a seal product surface roughness, surface characteristics, pressure, medium, temperature, seal material, seal type and speed of movement these are the factors that affect the seal. The last is the surface treatment, experience shows that the cylinder piston and piston rod surface characteristics have a very big impact on the life of the seal. Surface properties are often defined by the value of surface roughness RA, which is the arithmetic mean of the absolute value of the surface shape deviating from the center line. However, these values do not fully represent the impact of surface conditions on seals, because even under the same roughness, different surface shape characteristics can lead to different degrees of seal wear.

This article by xingtai aohua rubber seal products factory finishing